we this morning are learning what science tastes like. the students in d.c. did their lab work on location. they went to a place where molecules and a master chef made for a tasty lesson. >> reporter: love the taste of hot peppers but not the heat? a little chemistry in the kitchen with make that happen. this gadget is called a roto evaporator. >> basically what we're doing is we have lady bug peppers so we're extracting all the flavor without the heat. >> reporter: chef rj not only knows how to tempt the taste buds. >> try that. sour. super sour, right? >> reporter: he and his team know the science behind it, too, and they're sharing their knowledge with fifth graders from two rivers charter school in d.c. >> do you have to use chem stray in cooking? >> reporter: yes. they're on a chemistry expedition and they came armed with questions. >> what does freezing food do to the at toms and molecules which cause it to get hard? >> why does food taste good to one person but bad to the other? >> reporter: seeing how heat transfers and chemical reactions take place i